Townscaper

Townscaper has no inherent objective or story, and has been described by developer Stålberg as "more of a toy" than a game. Users construct an island town by placing and removing colored blocks on an ocean. Various "rules" dictate these blocks' appearances, with some appearing as spires and others as balconies. This method of rule-based decoration allows arches, gardens, and stairways to be created without specific user instruction. (wikipedia.org).